Dynacord DPA 4120 Standby indicator, Ready indicator, Protect indicator, Ground Fault indicator

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6.1STANDBY indicator

When the appliance is correctly connected and mains and/or battery power is present, the green STANDBY indicator

(4) will light.

6.2READY indicator

Both amplifiers, the DPA 4120 and the DPA 4140, employ power-on switching delays of approximately 3 sec. to effectively eliminate power-on switching noise. After this time, the green READY indicator (7) lights and the READY fault message relay picks up when no error is being detected. When the power amplifier's mains transformer exceeds a certain value or, when – with installed NRS 90224 extension – the pilot tone falls below the threshold (see also paragraph 8.5.1), the green READY indicator (7) is not lit and the READY fault message relay drops.

6.3PROTECT indicator

When thermal overload of the mains transformer or the power amplification stage is encountered, the red PROTECT indicator (5) will light and the READY fault message relay drops. After the amplifier regained normal temperature, the red PROTECT indicator (5) is automatically dimmed and the appliance returns to normal operation. High temperature can be caused by overload, extreme ambient temperatures or faulty functioning of the system's ventilation.

6.4GROUND FAULT indicator

If, with the NRS 90224 extension installed, a ground fault is being detected at the power output, the red GROUND FAULT indicator (6) will light and the READY fault message relay will drop. During the occurrence of this error normal operation is maintained. After eliminating the cause for the ground fault, pressing the TEST button (3) resets the GROUND FAULT indicator (6) (see also paragraph 8.5.2).

6.5Level meter and CLIP indicator

The green LED-indicators -13dB and 0dB (1) together with the red CLIP-LED (2) allow to monitor the output level, effectively avoiding overdrive conditions that lead to distortion and overload at the power outputs which could damage the connected loudspeaker systems.

-If the red CLIP-LED (2) shortly lights during program peaks, maximum non-distorted modulation is achieved.

-Continuous lighting or blinking of the red CLIP-LED (2) signals overdrive. In this case the input level has to be reduced.

-If the green LED indicator (1) does not light or is only briefly lit with the red CLIP-LED blinking at the same time, this signals the encountering of an overload or short-circuit condition at the output. In this case the impedance of the connected load has to be checked.

Caution During normal operation the red CLIP-LED should only light briefly and shortly!

7.Switching the output voltage (only to be performed by a qualified service technician!)

The DPA 4120 and DPA 4140 amplifiers allow the connection of 50V, 70V, 100V or low-impedance loudspeaker systems (4 ohms). They are factory-preset to an output voltage of 100 V. Switching the output voltage to 4 ohms, 50V or 70V can be performed by changing the bridge B411 on the power amplifier printed board assembly 84187 (DPA

4120) or 84175 (DPA 4140):

Caution Before opening the appliance, make sure to disconnect the mains and/or battery power source!

-To open the appliance, the top panel has to be removed.

-The bridge B411 (yellow wire) has to be removed from the contact B407 and re-attached to the desired contact (see table 1) (see also figure 8 respectively figure 9).

-he coding-bridges S405 and S406 for the output recognition have to be inserted according to the illustration in figure 5.

(the inserted coding-bridge is marked in black)

-The top panel has to be re-attached.

Note

By using a waterproof marker pen and after switching the output voltage, the newly set value

 

has to be marked in the filed "OUTPUT VOLTAGE" on the rear panel of the appliance.

 

 

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Contents Performance Features Power Amplifier DPA 4120 / DPAPage 12 a Indicators, controls and connectionsContents Utilization InstallationAmplifier has to be protected from Before the first operationInput Battery operation 24V DCOutputs Power Output for 100V 70V or 50V loudspeaker systemsRemote Control connector only NRS Power Output for low impedance loudspeaker systemsIndicators Single Call and obligatory reception relays Override BypassReady indicator Standby indicatorProtect indicator Ground Fault indicatorEnhanced application field Standard input module NRS NRS 90208 input transformer for the floating, balanced input Remote module NRSRe-insert the input module and tighten the locking screws B NRS 90224 pilot tone & ground fault surveillance Ground fault surveillancePilot tone surveillance NRS 90 406 S 411 Checking the pilot tone surveillance function Case and 19-rack-shelf system installation Checking the ground fault surveillance functionGround lift switch Circuit ⊥ to Chassis Switch Fuses Fuses in the DPA503 502 503 F 601 602 Battery operation DPA 4140 power amplifier 400 W Power supply 13.5.2 Ground fault surveillance Extension kits for the DPA 4120 and DPANRS 90208 input transformer for floating, balanced input
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DPA 4120, DPA 4140 specifications

The Dynacord DPA 4120 and DPA 4140 are powerful amplifier solutions designed for professional audio applications. These models are ideal for live sound reinforcement, permanent installations, and various audio distribution requirements.

Both DPA 4120 and DPA 4140 are part of the Dynacord DPA series, which is renowned for delivering high-quality sound and reliability in demanding environments. The DPA 4120 provides a robust 1200 watts of power per channel at 4 ohms, while the DPA 4140 ups the ante with an impressive 1400 watts per channel at the same impedance, making them suitable for driving a wide range of speaker systems.

One of the standout features of both amplifiers is the incorporation of advanced DSP (Digital Signal Processing) technology. This technology offers precise control over sound performance, allowing users to tailor settings to meet specific venue acoustics or personal preferences. The DSP includes functions such as equalization, crossover adjustments, delay, and limiting, ensuring optimal sound delivery in any setting.

Durability is another hallmark of the Dynacord DPA series. The amplifiers feature a rugged, lightweight design, ideally suited for touring and rental companies. The internal architecture includes a sophisticated cooling system that allows for extended operation under high-demand conditions without overheating.

Both models are equipped with a range of connectivity options, including XLR inputs and Speakon outputs, facilitating seamless integration with various audio systems. The amplifiers support both analog and digital input sources, ensuring compatibility with modern audio setups.

In terms of sound quality, the DPA 4120 and DPA 4140 are engineered with low distortion levels and high efficiency, achieving high-performance audio output while maintaining clarity and detail across all frequencies. The amplifiers also feature a robust power supply that delivers consistent performance, even during peak use scenarios.

User-friendly controls and monitoring options are also inherent in the design of these amplifiers. An intuitive front panel interface allows for easy adjustment of settings, while LED indicators provide real-time feedback on performance and operational status.

In summary, the Dynacord DPA 4120 and DPA 4140 offer exceptional power, sound quality, and advanced features, making them excellent choices for audio professionals seeking reliable and powerful amplification solutions. Their combination of performance, durability, and versatility serves to meet the needs of various professional audio applications, solidifying their place in the competitive landscape of audio amplifiers.
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